Pre-heat oven to 450 degrees. Place 9x13 baking pans in the oven as it heats.
Heat 1 Tbsp olive oil in a large skillet over medium heat. Add sausage and cook while breaking up with a spoon or spatula until browned, about 5-7 minutes. Remove sausage to a bowl and set aside, leaving sausage grease in pan
Add sliced onion and salt to pan and cook until soft and just browning, for about 7 minutes. Remove from heat.
Divide dough into two portions. Wrap one portion in plastic wrap and store in fridge (can keep in fridge for about 7-10 days). On a lightly floured surface, roll the remaining dough portion into a roughly 9x13 inch rectangle.
Once oven is pre-heated remove pan and working quickly, sprinkle a little flour and/or cornmeal onto the pan (this will prevent the dough from sticking) and carefully place the dough rectangle on top.
Brush dough rectangle with 1 Tbsp of olive oil. Then sprinkle onions, sausage, grapes, and gorgonzola cheese evenly over the dough.
Bake for 9-12 minutes, until crust is golden. Sprinkle with red hot pepper flakes before serving.